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- Helicoplacus abstract "Helicoplacus (often misspelled Helioplacus) is the earliest well-studied fossil echinoderm. Fossil plates are known from several regions. Complete specimens were found in Lower Cambrian strata of the White Mountains of California. The animal was a cigar-shaped creature up to 7 centimetres (2.8 in) long that stood upright on one end. Unlike more typical echinoderms such as sea stars, Helicoplacus does not have fivefold symmetry. Instead, there is a spiral food groove on the outside along which food was moved to a mouth that is thought to be located on the side. The respiratory system appears to be primitive. Although the animal does not look like a typical echinoderm, the plates are composed of the characteristic calcareous plates known as stereom that are common to all echinoderms. The ambulacrum is similar to that of the Edrioasteroidea; as a result, Helicoplacoidea may belong to Pelmatozoa. Other contemporaneous echinoderms are known to have existed from their dissociated plates, but other than a few possible edrioasteroids, Helicoplacus is the earliest echinoderm that is well enough preserved to analyze its characteristics. One much earlier form called Arkarua has been hypothesized to be an ancestral echinoderm because of its fivefold symmetry. But Arkarua appears to lack both stereoms and a mouth.Helicoplacoids seem to have existed for about 15 million years[citation needed] in the Lower Cambrian, around 525 million years ago.[citation needed]Helicoplacoids are thought to have been suspension feeders living at moderate depths in highly-oxygenated water with strong enough currents to ensure a steady food supply. They are typically found in greenish shales and are rarely found in shallow water sandstones and limestones.".
- Helicoplacus class Helicoplacus.
- Helicoplacus kingdom Animal.
- Helicoplacus phylum Echinoderm.
- Helicoplacus thumbnail Helicoplacus.jpg?width=300.
- Helicoplacus wikiPageExternalLink pl00001.htm.
- Helicoplacus wikiPageID "220817".
- Helicoplacus wikiPageRevisionID "546473528".
- Helicoplacus classis "†Helicoplacoidea".
- Helicoplacus genus "Helicoplacus".
- Helicoplacus hasPhotoCollection Helicoplacus.
- Helicoplacus imageCaption "Helicoplacus guthi".
- Helicoplacus phylum Echinoderm.
- Helicoplacus rangeMap "Helicoplacus finds.svg".
- Helicoplacus rangeMapAlt "The contiguous United States are shaded in blue on this map of northern North America".
- Helicoplacus regnum "Animalia".
- Helicoplacus subdivision "* Helicoplacus curtisi * Helicoplacus guthi".
- Helicoplacus subdivisionRanks "Species".
- Helicoplacus subject Category:Cambrian_animals.
- Helicoplacus subject Category:Echinoderms.
- Helicoplacus subject Category:Prehistoric_invertebrates.
- Helicoplacus type Animal100015388.
- Helicoplacus type CambrianAnimals.
- Helicoplacus type Echinoderm102316707.
- Helicoplacus type Echinoderms.
- Helicoplacus type Invertebrate101905661.
- Helicoplacus type LivingThing100004258.
- Helicoplacus type Object100002684.
- Helicoplacus type Organism100004475.
- Helicoplacus type PhysicalEntity100001930.
- Helicoplacus type PrehistoricInvertebrates.
- Helicoplacus type Whole100003553.
- Helicoplacus type Animal.
- Helicoplacus type Eukaryote.
- Helicoplacus type Species.
- Helicoplacus type Animal.
- Helicoplacus type BiologicalLivingObject.
- Helicoplacus type EukaryoticCell.
- Helicoplacus type Organism.
- Helicoplacus comment "Helicoplacus (often misspelled Helioplacus) is the earliest well-studied fossil echinoderm. Fossil plates are known from several regions. Complete specimens were found in Lower Cambrian strata of the White Mountains of California. The animal was a cigar-shaped creature up to 7 centimetres (2.8 in) long that stood upright on one end. Unlike more typical echinoderms such as sea stars, Helicoplacus does not have fivefold symmetry.".
- Helicoplacus label "Helicoplacoidea".
- Helicoplacus label "Helicoplacoidea".
- Helicoplacus label "Helicoplacoidea".
- Helicoplacus label "Helicoplacoidea".
- Helicoplacus label "Helicoplacus".
- Helicoplacus label "海旋板".
- Helicoplacus label "螺板綱".
- Helicoplacus sameAs Helicoplacoidea.
- Helicoplacus sameAs Helicoplacoidea.
- Helicoplacus sameAs Helicoplacoidea.
- Helicoplacus sameAs 螺板綱.
- Helicoplacus sameAs Helicoplacoidea.
- Helicoplacus sameAs m.01g7x_.
- Helicoplacus sameAs Q143851.
- Helicoplacus sameAs Q143851.
- Helicoplacus sameAs Helicoplacus.
- Helicoplacus wasDerivedFrom Helicoplacus?oldid=546473528.
- Helicoplacus depiction Helicoplacus.jpg.
- Helicoplacus isPrimaryTopicOf Helicoplacus.